CN2715350Y - White light LED assembly - Google Patents
White light LED assembly Download PDFInfo
- Publication number
- CN2715350Y CN2715350Y CNU200420059316XU CN200420059316U CN2715350Y CN 2715350 Y CN2715350 Y CN 2715350Y CN U200420059316X U CNU200420059316X U CN U200420059316XU CN 200420059316 U CN200420059316 U CN 200420059316U CN 2715350 Y CN2715350 Y CN 2715350Y
- Authority
- CN
- China
- Prior art keywords
- light emitting
- white light
- emitting diode
- diode assembly
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000463 material Substances 0.000 claims abstract description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 22
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 150000004767 nitrides Chemical class 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000009877 rendering Methods 0.000 abstract description 9
- 239000005132 Calcium sulfide based phosphorescent agent Substances 0.000 abstract description 3
- 229910019990 cerium-doped yttrium aluminum garnet Inorganic materials 0.000 abstract description 3
- 108010043121 Green Fluorescent Proteins Proteins 0.000 abstract 2
- 229910052909 inorganic silicate Inorganic materials 0.000 abstract 1
- 238000000295 emission spectrum Methods 0.000 description 7
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 241001025261 Neoraja caerulea Species 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Images
Abstract
The utility model relates to a white light LED assembly which comprises a printed circuit card; a plurality of white light LED units are arranged on one side of the printed circuit card; each white light LED unit comprises a base material and a mixing fluorescent body; at least one blue LED is positioned on the base material; the mixing fluorescent body comprises a red fluorescent body, a green fluorescent body and a yellow fluorescent body, and the mixing fluorescent body is coated outside the blue LED; the red fluorescent body can adopt CaS:Eu or SrS:Eu; the yellow fluorescent body can adopt YAG:Ce or TbAG:Ce; the green fluorescent body can adopt SrGa2 S4 :Eu or Ca8 EuMnMg(SiO4)4 C12 for matching with the blue light of the blue LED to mix out the white light of high color rendering property.
Description
Technical field
The utility model relates to a kind of white light emitting diode assembly, especially a kind of white light emitting diode assembly that has luminous efficiency and color rendering concurrently.
Background technology
As the user cognitive, white light source is the light supply apparatus of electronic installation widespread demand, especially in markets such as family expenses scanner uni facsimile machine or color plane display backlight plate module, so its technological improvement mode also is the actively focus of research and development of each tame manufacturer.
Referring to Fig. 1, be the exploded view of the illuminated backlight module 10 in an edge, this edge-lit formula backlight module 10 comprises a plate shaped light guide sheet 100, be positioned at the fluorescent tube 102 of plate shaped light guide sheet 100 1 sides, be coated on these fluorescent tube 102 Outboard Sections surfaces fluorescent tube reflector plate 104, be positioned at a reflector plate 106 of plate shaped light guide sheet 100 downsides.This edge-lit formula backlight module 10 also comprises assemblies such as prismatic lens and light diffusing sheet, but because these assemblies are all known technology, does not repeat them here.When if this edge-lit formula backlight module 10 is used for a flat-panel screens, this fluorescent tube 102 (for example being a CCFL fluorescent tube) can send white light, and this white light emits from this fluorescent tube 102, or is reflected by fluorescent tube reflector plate 104 and direct into light guide sheet 100.This light guide sheet 100 can cooperate assemblies such as reflector plate 106, prismatic lens and light diffusing sheet and light is dispersed from the front equably, and for example back light of LCD etc. is provided.Yet the CCFL fluorescent tube has following point: (1) needs high drive, and the power circuit design is not easy; (2) luminous efficiency can change with temperature, therefore can not provide stable light source; And (3) fluorescent tube both sides luminous efficiency is relatively poor, becomes invalid luminous zone, therefore influences display quality.Above described example be application in display, if this edge-lit formula backlight module 10 is used for the one scan instrument, then because the undesirable characteristic of fluorescent tube 102 also can influence light source color temperature and scanning quality.
Along with the maturation of led technology and succeeding in developing of high brightness blue optical diode, the light source that another kind can replace fluorescent tube can be provided by light-emitting diode.Generally speaking, the white light emitting diode light source can be provided by following dual mode:
(1) red bluish-green Tricolor LED mixed light becomes white, however red bluish-green Tricolor LED one of them when breaking down, can't obtain normal white light, and in general, luminous efficiency is relatively poor;
(2) blue light-emitting diode collocation yellow fluorescent powder, however the colour temperature of light source is undesirable.
Summary of the invention
Main purpose of the present utility model is to provide a kind of white light emitting diode assembly that has luminous efficiency and color rendering concurrently, to solve the shortcoming of above-mentioned known white light emitting diode.
In order to achieve the above object, the utility model provides a kind of white light emitting diode assembly, and it comprises: a printed circuit board (PCB) has a plurality of sides; Be positioned at a plurality of white light emitting diodes unit on this printed circuit board (PCB) one side, each white light emitting diode unit comprises: a base material; At least one blue LED is positioned on this base material, and can be made for nitride-based compound semiconductor; One mixing phosphor comprises red-emitting phosphors, green-emitting phosphor and yellow fluorophor, and is coated on this blue LED outside.This red-emitting phosphors can adopt CaS:Eu or SrS:Eu; Yellow fluorophor can adopt YAG:Ce or TbAG:Ce; And green-emitting phosphor can adopt SrGa
2S
4: Eu or Ca
8EuMnMg (SiO
4)
4C
12, blend the white light of high color rendering with the blue light that cooperates blue LED.
According to above-mentioned conception, wherein also comprise the controller that is positioned on this printed circuit board (PCB) opposite side.
According to above-mentioned conception, wherein this controller can apply different drive currents to each white light emitting diode unit, to adjust colour temperature.
According to above-mentioned conception, wherein this white light emitting diode unit is surface mounting luminous diode unit, bulb type light emitting diode or directly packaging (COB) light emitting diode.
According to above-mentioned conception, wherein this base material is the insulation material.
According to above-mentioned conception, wherein the emission wavelength scope of this blue LED is 400-490nm.
According to above-mentioned conception, wherein this red-emitting phosphors, green-emitting phosphor and yellow fluorophor can be allocated by a certain percentage, to change the light emission color temperature of white light emitting diode unit.
In order further to illustrate feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, yet accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the utility model is limited.
Description of drawings
Fig. 1 is the exploded view of a known edge-lit formula backlight module;
Fig. 2 A is an end view of the utility model white light emitting diode assembly;
Fig. 2 B is the opposite side view of the utility model white light emitting diode assembly;
Fig. 3 is the schematic diagram of the utility model white light emitting diode unit;
Fig. 4 is the spectrogram of the utility model white light emitting diode unit.
Wherein, description of reference numerals is as follows:
Known:
10 backlight modules, 100 light guide sheet
102 fluorescent tubes, 104 fluorescent tube reflector plates
106 reflector plates
The utility model:
2 white light emitting diode assemblies, 20 printed circuit board (PCB)s
22 white light emitting diode unit, 220 substrates
LB blue LED RGY mixing phosphor
Embodiment
Shown in Fig. 2 A and Fig. 2 B, be schematic diagram according to a kind of white light emitting diode assembly 2 of preferred embodiments of the present utility model.This white light emitting diode assembly 2 comprises a printed circuit board (PCB) 20, be positioned at a plurality of white light emitting diodes unit 22 on this printed circuit board (PCB) one side and be positioned at controller 24 on this printed circuit board (PCB) opposite side.
Referring to shown in Figure 3, schematic diagram for each white light emitting diode unit 22, it comprises a base material 220 (for example can be an insulating substrate), be positioned at the blue LED LB (can be made for nitride-based compound semiconductor) on the base material 220 and be positioned at redness, green and yellow mixing phosphor RGY on the blue LED LB, and wherein this mixing phosphor RGY comprises the mixing of red-emitting phosphors PR, green-emitting phosphor PG and yellow fluorophor PY.
Be provided with the conductor part (not shown) in above-mentioned white light emitting diode unit 22, the electrical connections (not shown) that negative electrode and the anode of blue LED LB can be connected to base material 220 is to supply power on the blue LED LB.Yet the electrode interconnection technique relevant for blue LED LB is a known technology, is not this case emphasis, does not therefore repeat them here.Moreover above-mentioned illustrated white light emitting diode unit is the surface installing type encapsulation, but this white light emitting diode unit also can be other form encapsulation, as bulb type encapsulation or directly packaging (chip on board, COB) light emitting diode.
During the outgoing blue ray, red-emitting phosphors PR, green-emitting phosphor PG and yellow fluorophor PY among the aforementioned mixing phosphor RGY be can excite when aforesaid blue-light LED chip LB making current, and red light, green light and sodium yellow emergent ray produced.
Referring to Fig. 4, emission spectrum for the white light emitting diode unit 22 of the utility model preferred embodiment is respectively the spectrum of blue LED LB, the emission spectrum of green-emitting phosphor PG, the emission spectrum of yellow fluorophor PY and the emission spectrum of red-emitting phosphors PR from left to right.Compare with the spectrum of known technology, the emission spectrum of the utility model white light emitting diode unit 22 has included more wide visible light wave range, therefore has preferable color rendering.Moreover, because generally speaking the emission spectrum of fluorophor is than the emission spectrum broadness of light-emitting diode, therefore can reach better color rendering.
Because of simple when using the sodium yellow fluorophor color rendering of its white light not good, therefore in fluorescent glue, add red, green light fluorophor to increase its color rendering.And red, yellow, green-emitting phosphor are pressed the proper proportion mixing preparation, white light be can obtain or various colour temperatures, coloured light mixed.
Among redness of the present utility model, green and the yellow mixing phosphor RGY, this red-emitting phosphors can adopt CaS:Eu or SrS:Eu; Yellow fluorophor can adopt YAG:Ce or TbAG:Ce; And green-emitting phosphor can adopt SrGa
2S
4: Eu or Ca
8EuMnMg (SiO
4)
4C
12But except aforementioned phosphors, also have other available fluorophor, the utility model is not only to limit the use of above-mentioned fluorophor, also can select for use other can be by blue light wavelength (400～490nm) scope excited fluorescent body materials.
Moreover, in above-mentioned preferred embodiment, also the mixture of RGY fluorescent material by red-emitting phosphors PR and green-emitting phosphor PG can be replaced, can reach the effect of sending white light equally.
In sum, white light emitting diode assembly of the present utility model can have luminous efficiency and color rendering concurrently.Yet the above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model scope of patent protection are modified and changed, and all belong in the scope of the utility model patent protection.
Claims (23)
1, a kind of white light emitting diode assembly is characterized in that, this assembly comprises:
One printed circuit board (PCB);
Be positioned at a plurality of white light emitting diodes unit on this printed circuit board (PCB) one side;
Each white light emitting diode unit comprises: a base material; At least one blue LED is positioned on this base material; And a mixing phosphor, comprise red-emitting phosphors, green-emitting phosphor and yellow fluorophor, and be coated on this blue LED outside.
2, white light emitting diode assembly as claimed in claim 1 is characterized in that, also comprises the controller that is positioned on this printed circuit board (PCB) opposite side.
3, white light emitting diode assembly as claimed in claim 2 is characterized in that, this controller can apply different drive currents to each white light emitting diode unit, to adjust colour temperature.
4, white light emitting diode assembly as claimed in claim 1 is characterized in that, this red-emitting phosphors can adopt CaS: Eu or SrS: Eu.
5, white light emitting diode assembly as claimed in claim 1 is characterized in that, this green-emitting phosphor can adopt SrGa
2S
4: Eu or Ca
8EuMnMg (SiO
4)
4C
12
6, white light emitting diode assembly as claimed in claim 1 is characterized in that, this yellow fluorophor can adopt YAG: Ce or TbAG: Ce.
7, white light emitting diode assembly as claimed in claim 1 is characterized in that, this white light emitting diode unit is the surface mounting luminous diode unit.
8, white light emitting diode assembly as claimed in claim 1 is characterized in that, this white light emitting diode unit is the bulb type light emitting diode.
9, white light emitting diode assembly as claimed in claim 1 is characterized in that, this white light emitting diode unit is direct packaging light emitting diode.
10, white light emitting diode assembly as claimed in claim 1 is characterized in that, this base material is the insulation material.
11, white light emitting diode assembly as claimed in claim 1 is characterized in that, this blue LED is that nitride-based compound semiconductor is made.
12, white light emitting diode assembly as claimed in claim 1 is characterized in that, the emission wavelength scope of this blue LED is 400-490nm.
13, white light emitting diode assembly as claimed in claim 1 is characterized in that, this red-emitting phosphors, green-emitting phosphor and yellow fluorophor can be allocated by a certain percentage, to change the light emission color temperature of white light emitting diode unit.
14, a kind of white light emitting diode assembly is characterized in that, this assembly comprises:
One printed circuit board (PCB);
Be positioned at a plurality of white light emitting diodes unit on this printed circuit board (PCB) one side;
Each white light emitting diode unit comprises: a base material; At least one blue LED is positioned on this base material; And a mixing phosphor, comprise red-emitting phosphors and green-emitting phosphor, and be coated on this blue LED outside.
15, white light emitting diode assembly as claimed in claim 14 is characterized in that, also comprises the controller that is positioned on this printed circuit board (PCB) opposite side.
16, white light emitting diode assembly as claimed in claim 14 is characterized in that, this red-emitting phosphors can adopt CaS: Eu or SrS: Eu.
17, white light emitting diode assembly as claimed in claim 14 is characterized in that, this green-emitting phosphor can adopt SrGa
2S
4: Eu or Ca
8EuMnMg (SiO
4)
4C
12
18, white light emitting diode assembly as claimed in claim 14 is characterized in that, this white light emitting diode unit is the surface mounting luminous diode unit.
19, white light emitting diode assembly as claimed in claim 14 is characterized in that, this white light emitting diode unit is the bulb type light emitting diode.
20, white light emitting diode assembly as claimed in claim 14 is characterized in that, this white light emitting diode unit is direct packaging light emitting diode.
21, white light emitting diode assembly as claimed in claim 14 is characterized in that, this base material is the insulation material.
22, white light emitting diode assembly as claimed in claim 14 is characterized in that, this blue LED is that nitride-based compound semiconductor is made.
23, white light emitting diode assembly as claimed in claim 14 is characterized in that, the emission wavelength scope of this blue LED is 400-490nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200420059316XU CN2715350Y (en) | 2004-04-28 | 2004-04-28 | White light LED assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200420059316XU CN2715350Y (en) | 2004-04-28 | 2004-04-28 | White light LED assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2715350Y true CN2715350Y (en) | 2005-08-03 |
Family
ID=34872861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200420059316XU Expired - Fee Related CN2715350Y (en) | 2004-04-28 | 2004-04-28 | White light LED assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2715350Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401516C (en) * | 2004-04-28 | 2008-07-09 | 宏齐科技股份有限公司 | White light LED assembly and making method thereof |
-
2004
- 2004-04-28 CN CNU200420059316XU patent/CN2715350Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401516C (en) * | 2004-04-28 | 2008-07-09 | 宏齐科技股份有限公司 | White light LED assembly and making method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050803 |